<!DOCTYPE html>
<html>
	<head>
		<meta charset="utf-8">
		<title>07 案例体现作用域内部原理过程</title>
	</head>
	<body>
		<script type="text/javascript">
			function fn(a){
				// console内置对象
				console.log(a);
			}
			fn(2);
		</script>
	</body>
</html>
